Current Attempt in Progress In its first month of operations, Ivanhoe Company made three purchases of merchandise in the following sequence: (1) 300 units at $4, (2) 400 units at $5, and (3) 500 units at $8. Ivanhoe uses a periodic inventory system. (a1) Calculate weighted-average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Weighted-average unit cost eTextbook and Media Attempts: unlimited (a2) The parts of this question must be completed in order. This part will be available when you complete the part above. Compute the cost of the ending inventory under the average-cost method, assuming there are 200 units on hand at the end of the period. (Round answer to 0 decimal places, e.g. 125.) Cost of the ending inventory